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钻孔卸压是防治冲击矿压的一种有效卸压措施。卸压效果主要受钻孔孔深、孔径、布置角度及其组合方式的影响。在正交试验设计基础上进行数值模拟研究,并对模拟结果进行多指标综合平衡分析,得出了钻孔深度、孔径及布置角度对卸压效果的影响规律,并选取孔径为133mm,上下2排钻孔的角度分别为15°和8°,孔深30 m和60 m交错卸压的组合卸压方式,结果符合现场工程的实际情况。
Borehole pressure relief is an effective measure to prevent and control rock burst. The pressure relief effect is mainly affected by the hole depth, the hole diameter, the layout angle and the combination mode. Based on the orthogonal experimental design, the numerical simulation was carried out, and the multi-index comprehensive equilibrium analysis of the simulation results was carried out. The influence of drilling depth, aperture and arrangement angle on the pressure relief effect was obtained. The aperture of 133mm, Row drilling angle of 15 ° and 8 °, hole depth of 30 m and 60 m interleaved pressure relief combination pressure relief mode, the results in line with the actual situation of the field project.